Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent
1998-02-10
2000-06-06
Kincaid, Kristine
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
165 803, 454207, 454208, H05K 900
Patent
active
060721197
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention is related generally to electromagnetic radiation and, more particularly, to filter arrangements that block such radiation.
BACKGROUND OF THE INVENTION
Filter arrangements that are inserted into a mounting wall are known in the art. Many such filters are substantially structurally similar to one another, irrespective of whether they are constructed with or without a fan. Insofar as is known, there are no such filters that have the capability to exclude or block high-frequency (HF) electromagnetic radiation. Given the requirements to use filters in sensitive and interference prone electronic devices, a filter arrangement that would afford protection from HF radiation would be an important improvement in the art.
OBJECTS OF THE INVENTION
It is an object of this invention to provide a filter arrangement overcoming some of the problems and shortcomings of devices of the prior art.
Another object of this invention is to provide a filter arrangement that is HF-impervious. How these and other important objects are accomplished will be apparent from the following descriptions and from the drawings.
SUMMARY OF THE INVENTION
The invention involves a filter arrangement comprised of: (1) an assembly plate having an aperture in its center; (2) an electrically conductive contact frame inserted into the aperture of the assembly plate; (3) a filter housing having an outlet side, an inlet side and a center opening, connected to the contact frame; (4) a filter mat placed in the opening in the filter housing; (5) an electrically conductive grid located between the filter housing and the filter mat; and (6) a lamellar screen covering the filter mat.
In a preferred embodiment of the invention, a fan is attached to the inlet side of the filter housing and the electrically conductive grid is positioned between the filter housing and the fan. In a more specific version of this embodiment, the fan has an outlet and inlet side and the inlet side of the fan is covered by a protective screen. In still another version, the fan projects through both the contact frame and the aperture of the mounting plate.
In another aspect of the invention, the filter housing is constructed of plastic in which electrically-conductive material is mixed or which has been "metallized" or vapor-coated with a conductive substance so as to be electrically conductive. In another embodiment of the invention, the filter housing has a receptacle formed into its outlet side and the filter mat and grid are inserted into the receptacle.
In yet another aspect of the invention, the filter housing has a circumscribing fastening flange with fastening bore holes and screws passing through the fastening bore holes to secure the filter housing to the mounting plate. In a specific version of such preferred embodiment, the mounting plate has a contact surface surrounding the aperture and the contact surface contains a plurality of screw receptacles arranged around the aperture.
In still another aspect of the invention, the inlet side of the filter housing is covered by a mesh holding screen and such holding screen supports the grid and filter mat. The holding screen may be constructed in one piece together with the filter housing.
In yet another aspect of the invention, the contact frame projects into the aperture of the assembly plate. The first and second edges of each of a plurality of contact springs contact the plate and the filter housing, respectively, so as to electrically connect the plate and the filter housing to one another.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of an embodiment of the inventive filter arrangement.
FIG. 2 is an exploded perspective view of another embodiment of the filter arrangement including a fan.
DETAILED DESCRIPTIONS OF THE PREFERRED EMBODIMENTS
As can be seen in FIG. 1, the invention involves a filter arrangement comprised of a mounting plate 27, such as the wall of a device in a control cabinet, having an aperture 26 surrounded by a contacting surfac
REFERENCES:
patent: 3446906 (1969-05-01), Zulauf
patent: 5007946 (1991-04-01), Babini
Nicolai Walter
Pawlowski Adam
Schuler Wolfgang
Strackbein Heinrich
Kincaid Kristine
Ngo Hung V
Rittal--Werk Rudolf Loh GmbH & Co. KG
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